{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "soft-sail-bermuda",
 "name": "Soft sail (Bermuda rig)",
 "kind": "standard",
 "category": "Boat design",
 "group": "Sailboat appendages",
 "year": null,
 "question": "How does a soft sail compare with a wing sail?",
 "tags": [
  "vehicle design",
  "sailboat appendages",
  "rc design",
  "aerodynamics",
  "guide"
 ],
 "aliases": [
  "soft sail",
  "bermuda rig",
  "mainsail",
  "rc yacht sails",
  "IOM rig",
  "jib and main",
  "fractional rig",
  "sail aspect ratio",
  "rc sail size"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/soft-sail-bermuda/",
 "sheet_txt": "https://xemstudio.com/objects/soft-sail-bermuda/sheet.txt",
 "sheet": {
  "basis": "Design rules and figures from the cited sources; example geometry by Xem Studio",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Soft sails take camber from the wind and can be reefed; they need more angle of attack than a wing (Wikipedia).",
   "The IOM class uses a Bermuda sloop with fractional rig and three sizes (onemetre.net).",
   "Used on: International One Metre (IOM)."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "IOM A rig area",
     "~6000 sq cm",
     "onemetre.net"
    ],
    [
     "IOM B / C rig",
     "~4100 / ~2700 sq cm",
     "onemetre.net"
    ],
    [
     "IOM A rig aspect ratio",
     "~4.8",
     "onemetre.net"
    ]
   ]
  }
 },
 "sheet_text": "Soft sail (Bermuda rig) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/soft-sail-bermuda/  (sheet CC BY 4.0)\nBasis: Design rules and figures from the cited sources; example geometry by Xem Studio\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Soft sails take camber from the wind and can be reefed; they need more angle of attack than a wing (Wikipedia).\n- The IOM class uses a Bermuda sloop with fractional rig and three sizes (onemetre.net).\n- Used on: International One Metre (IOM).\n\nparameter  value or range  source\nIOM A rig area  ~6000 sq cm  onemetre.net\nIOM B / C rig  ~4100 / ~2700 sq cm  onemetre.net\nIOM A rig aspect ratio  ~4.8  onemetre.net\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Wingsail — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Wingsail\n- onemetre.net: The IOM class — web — Publisher's page; dimensions are facts — https://onemetre.net/OtherTopics/IOMclass/IOM.htm\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=soft-sail-bermuda\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Wingsail",
   "url": "https://en.wikipedia.org/wiki/Wingsail",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "onemetre.net",
   "title": "The IOM class",
   "url": "https://onemetre.net/OtherTopics/IOMclass/IOM.htm",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "fin-keel-bulb",
  "spade-rudder",
  "skeg-hung-rudder",
  "daggerboard",
  "centreboard",
  "canting-keel"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "How many rigs does an IOM have?",
   "a": "Three sizes: A (~6000 sq cm), B (~4100) and C (~2700) (onemetre.net)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/soft-sail-bermuda/index.md"
}